/* =========================================================
   scene7.cn 专题站 全站共享样式
   设计:深色科技风(创意/工具类),主题色:深蓝/紫/青
   ========================================================= */
:root {
  --bg: #0a0f1d;
  --bg-2: #0e162a;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e9edf6;
  --text-mute: #9ba6bf;
  --text-dim: #6f7a93;
  --primary: #6c5ce7;
  --primary-2: #4f7cff;
  --violet: #a78bfa;
  --accent: #22d3ee;
  --warning: #f59e0b;
  --danger: #f43f5e;
  --gradient: linear-gradient(135deg, #4f7cff 0%, #6c5ce7 45%, #a78bfa 80%, #22d3ee 110%);
  --gradient-soft: linear-gradient(135deg, rgba(79, 124, 255, 0.18), rgba(34, 211, 238, 0.18));
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --max-w: 1200px;
  --shadow-1: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-2: 0 18px 50px rgba(0, 0, 0, 0.45);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 80% -10%, rgba(124, 92, 255, 0.18), transparent 60%),
              radial-gradient(1000px 500px at -10% 30%, rgba(34, 211, 238, 0.12), transparent 60%),
              var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: #5cf0ff; }
button { font-family: inherit; cursor: pointer; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 22px; }

/* ============ Header / Nav ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: rgba(10, 15, 29, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .25s;
}
.site-header.is-scrolled { border-bottom-color: var(--border); background: rgba(10, 15, 29, 0.92); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; letter-spacing: 0.4px; }
.brand img { width: 34px; height: 34px; }
.brand-text { font-size: 18px; }
.brand-text small { display: block; font-size: 11px; font-weight: 400; color: var(--text-mute); margin-top: 2px; letter-spacing: 1.2px; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a { color: var(--text); padding: 8px 14px; border-radius: 8px; font-size: 14.5px; }
.nav a:hover { color: #fff; background: var(--surface); }
.nav a.is-active { color: #fff; background: var(--surface-2); }

.nav-toggle { display: none; background: transparent; border: 1px solid var(--border-strong); color: var(--text); padding: 6px 10px; border-radius: 8px; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 12px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; transition: transform .15s, box-shadow .2s, background .2s, color .2s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff; box-shadow: 0 10px 28px rgba(79, 124, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 14px 36px rgba(108, 92, 231, 0.5); color: #fff; }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); color: #fff; }
.btn-sm { padding: 8px 14px; font-size: 13px; border-radius: 9px; }

/* ============ Hero ============ */
.hero { position: relative; padding: 76px 0 56px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -1px 0 0 0; pointer-events: none;
  background:
    radial-gradient(800px 400px at 70% 10%, rgba(124, 92, 255, 0.28), transparent 70%),
    radial-gradient(700px 360px at 20% 80%, rgba(34, 211, 238, 0.2), transparent 70%);
  z-index: 0;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(28px, 4vw, 48px); line-height: 1.18; margin: 0 0 18px; letter-spacing: 0.5px; }
.hero h1 .accent { background: var(--gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 17px; color: var(--text-mute); margin: 0 0 28px; max-width: 580px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.hero-meta .chip { background: var(--surface); border: 1px solid var(--border); color: var(--text-mute); padding: 6px 12px; border-radius: 999px; font-size: 12.5px; }

.hero-card {
  position: relative; padding: 22px; border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}
.hero-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 60%, rgba(34, 211, 238, 0.07));
}
.hero-card h3 { margin: 0 0 6px; font-size: 16px; color: var(--text); }
.hero-card p { margin: 0 0 12px; color: var(--text-mute); font-size: 13.5px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.hero-stats .stat { padding: 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--border); text-align: center; }
.hero-stats .stat b { display: block; font-size: 20px; color: #fff; }
.hero-stats .stat span { font-size: 12px; color: var(--text-mute); }

/* ============ Section ============ */
.section { padding: 72px 0; position: relative; }
.section h2 { font-size: clamp(24px, 2.6vw, 34px); margin: 0 0 12px; letter-spacing: 0.5px; }
.section .subhead { color: var(--text-mute); margin: 0 0 36px; font-size: 15.5px; max-width: 720px; }
.section-divider { height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); margin: 0; }

/* ============ Feature Cards ============ */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card {
  position: relative; padding: 24px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border); transition: transform .2s, border-color .2s, background .2s;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--border-strong); background: var(--surface-2); }
.feature-card .ic { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: var(--gradient-soft); border: 1px solid var(--border-strong); color: var(--accent); margin-bottom: 14px; }
.feature-card h3 { margin: 0 0 8px; font-size: 17px; }
.feature-card p { margin: 0; color: var(--text-mute); font-size: 14.5px; }
.feature-card .tag { display: inline-block; margin-top: 12px; font-size: 12px; color: var(--violet); background: rgba(167, 139, 250, 0.12); padding: 3px 10px; border-radius: 999px; }

/* ============ Preview Gallery ============ */
.preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.preview-card { margin: 0; padding: 0; border-radius: var(--radius); overflow: hidden; background: var(--surface); border: 1px solid var(--border); }
.preview-card .img-wrap { aspect-ratio: 9/16; background: #060912; display: grid; place-items: center; overflow: hidden; }
.preview-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s; }
.preview-card:hover img { transform: scale(1.04); }
.preview-card figcaption { padding: 10px 14px 14px; font-size: 13.5px; color: var(--text-mute); }
.preview-card figcaption b { color: var(--text); display: block; margin-bottom: 2px; font-size: 14px; }

/* ============ Hub / Inner-page links ============ */
.hub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.hub-card {
  display: block; padding: 24px; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), var(--surface));
  border: 1px solid var(--border); color: var(--text); transition: border-color .2s, transform .2s;
}
.hub-card:hover { border-color: var(--accent); transform: translateY(-3px); color: var(--text); }
.hub-card .step-no { font-size: 12px; color: var(--text-mute); letter-spacing: 1.4px; }
.hub-card h3 { margin: 6px 0 8px; font-size: 18px; }
.hub-card p { color: var(--text-mute); font-size: 14.5px; margin: 0 0 14px; }
.hub-card .arrow { color: var(--accent); font-weight: 600; font-size: 14px; }

/* ============ Steps timeline ============ */
.steps { counter-reset: step; display: flex; flex-direction: column; gap: 16px; }
.step {
  position: relative; padding: 22px 22px 22px 78px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
}
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 22px; top: 22px;
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--gradient); color: #fff; display: grid; place-items: center;
  font-weight: 700; font-size: 17px;
  box-shadow: 0 6px 16px rgba(79, 124, 255, 0.4);
}
.step h3 { margin: 0 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--text-mute); font-size: 14.5px; }
.step .tip { display: inline-block; margin-top: 8px; font-size: 12.5px; color: var(--accent); }

/* ============ Reviews ============ */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.review { padding: 22px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.review .stars { color: #facc15; font-size: 14px; letter-spacing: 1px; }
.review .quote { color: var(--text); font-size: 14.5px; line-height: 1.7; margin: 0; }
.review .person { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.review .avatar { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; }
.review .person div b { display: block; font-size: 14px; }
.review .person div span { font-size: 12.5px; color: var(--text-mute); }

/* ============ FAQ ============ */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item { border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); overflow: hidden; }
.faq-item summary { list-style: none; cursor: pointer; padding: 18px 20px; font-size: 15.5px; color: var(--text); position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); color: var(--accent); font-size: 22px; font-weight: 600; }
.faq-item[open] summary::after { content: "−"; }
.faq-item .answer { padding: 0 20px 18px; color: var(--text-mute); font-size: 14.5px; }

/* ============ Bottom CTA ============ */
.cta-band {
  margin: 64px 0 0; padding: 44px; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(79, 124, 255, 0.18), rgba(34, 211, 238, 0.16));
  border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: space-between; gap: 22px; flex-wrap: wrap;
}
.cta-band h3 { margin: 0 0 6px; font-size: 22px; }
.cta-band p { margin: 0; color: var(--text-mute); max-width: 560px; }

/* ============ Article (inner pages) ============ */
.article { padding: 56px 0 28px; }
.article h1 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.25; margin: 0 0 18px; letter-spacing: 0.4px; }
.article .meta { color: var(--text-mute); font-size: 13.5px; margin: 0 0 24px; }
.article h2 { font-size: 22px; margin: 36px 0 12px; }
.article h3 { font-size: 17.5px; margin: 24px 0 8px; }
.article p, .article li { color: var(--text); font-size: 15.5px; line-height: 1.85; }
.article ul, .article ol { padding-left: 22px; margin: 8px 0 18px; }
.article ul li, .article ol li { margin-bottom: 6px; }
.article .lead { color: var(--text-mute); font-size: 16px; }
.article blockquote { margin: 18px 0; padding: 14px 18px; background: var(--surface); border-left: 3px solid var(--accent); border-radius: 10px; color: var(--text-mute); }
.article table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; }
.article table th, .article table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.article table th { color: var(--text); font-weight: 600; background: var(--surface); }
.article .related { margin-top: 48px; padding: 22px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.article .related h3 { margin-top: 0; }
.article .related ul { margin: 8px 0 0; }

/* ============ Footer ============ */
.site-footer { margin-top: 56px; padding: 40px 0 26px; border-top: 1px solid var(--border); background: rgba(0, 0, 0, 0.2); }
.site-footer .container { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.site-footer h4 { margin: 0 0 12px; font-size: 14px; color: var(--text); letter-spacing: 1px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 8px; }
.site-footer ul li a { color: var(--text-mute); font-size: 14px; }
.site-footer ul li a:hover { color: #fff; }
.site-footer .copy { color: var(--text-dim); font-size: 12.5px; line-height: 1.8; }
.site-footer .disclaimer { color: var(--text-dim); font-size: 12px; line-height: 1.8; margin-top: 10px; }
.site-footer .bottom { margin-top: 26px; padding-top: 18px; border-top: 1px dashed var(--border); color: var(--text-dim); font-size: 12.5px; }

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .hero .container { grid-template-columns: 1fr; gap: 36px; }
  .features-grid, .preview-grid, .hub-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: rgba(10, 15, 29, 0.98); border-bottom: 1px solid var(--border); padding: 12px 22px; flex-direction: column; align-items: stretch; gap: 4px; }
  .nav.is-open { display: flex; }
  .nav a { padding: 10px 12px; }
  .nav-toggle { display: inline-flex; }
  .features-grid, .preview-grid, .hub-grid, .reviews-grid { grid-template-columns: 1fr; }
  .site-footer .container { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 32px; }
  .section { padding: 52px 0; }
  .step { padding: 18px 18px 18px 70px; }
  .step::before { left: 18px; top: 18px; width: 36px; height: 36px; font-size: 15px; }
  .cta-band { padding: 28px; }
}